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CN101803303A - Method and system for managing transmission of fragmented data packets - Google Patents

Method and system for managing transmission of fragmented data packets Download PDF

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Publication number
CN101803303A
CN101803303A CN200880104877A CN200880104877A CN101803303A CN 101803303 A CN101803303 A CN 101803303A CN 200880104877 A CN200880104877 A CN 200880104877A CN 200880104877 A CN200880104877 A CN 200880104877A CN 101803303 A CN101803303 A CN 101803303A
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datagram
segment
data
segmentation
segments
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CN200880104877A
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Chinese (zh)
Inventor
安德烈亚斯·厄曼
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Packetfront Sweden AB
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Packetfront Sweden AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2408—Traffic characterised by specific attributes, e.g. priority or QoS for supporting different services, e.g. a differentiated services [DiffServ] type of service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2441—Traffic characterised by specific attributes, e.g. priority or QoS relying on flow classification, e.g. using integrated services [IntServ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/32—Flow control; Congestion control by discarding or delaying data units, e.g. packets or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/166—IP fragmentation; TCP segmentation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

一种在包括终端设备和中间路由或交换设备的网络内管理分段数据报传输的方法，其中数据报的分段在上游中间设备上执行，该方法包括：在下游中间设备上接收和临时存储第一数据报分段，该分段包括允许数据报分段分类的数据；和在下游设备上接收和临时存储同一数据报的后续分段，直到：i)接收到全部数据报分段，此时根据第一分段的分类数据分类和传输全部分段；或者ii)已经经过预定时间周期和丢失至少一个分段，此时启动除了传输给下一设备之外的动作。

Figure 200880104877

A method of managing the transmission of fragmented datagrams within a network comprising terminal equipment and intermediate routing or switching equipment, wherein the fragmentation of the datagram is performed at an upstream intermediate equipment, the method comprising: receiving and temporarily storing at a downstream intermediate equipment A first datagram fragment that includes data that allows datagram fragment classification; and subsequent fragments of the same datagram are received and temporarily stored on a downstream device until: i) all datagram fragments are received, at which point or ii) a predetermined period of time has elapsed and at least one segment has been lost, at which point an action other than transmission to the next device is initiated.

Figure 200880104877

Description

Be used to manage the method and system of segmented data packets transmission
Technical field
The present invention relates to be used on data network, managing the method and system of segmented data packets (fragmented datepackets) transmission.
Background technology
Be used for deal with data and general network involved in the present invention and comprise a series of intermediate equipments (for example router) that participate in data generation and demonstration or the terminal equipment that uses and be responsible for guaranteeing data communication between terminal equipment.Created Internet protocol (Internet Protocol) to be supported in the data communication on this type of network.
Design IP is divided into a plurality of littler fragments or segmentation with permission with packet or datagram, thereby makes these fragments or segmentation by having the link than the MTU (MTU) that original packet/the datagram size is littler.This allows to use the IP agreement on the link of many types.Usually carry out packet segmentation by the router that is connected to link with littler MTU.Usually re-assembly by receiving the main frame execution, be about to whole segmentations and combine the work that constitutes complete packet.This means that then each segmentation is transmitted separately and arrived at end host up to it in case with the IP packet segmentation on packet network.If lost a segmentation, then whole original datagram is lost and must be transmitted (if possible) again.
Thereby the branch group categories is to be used for analyzing the generic term that the datagram content determines which stream packet-priority, this grouping belong to, service quality (QoS) parameter which is comprised rate limit (for example monitoring or finishing) is applied to divide into groups etc. by router or switch.
Carry out the branch group categories by some field of analyzing in the grouping.Usually IP stem (header) field and the protocol fields that are used for source and target IP address.In more advanced execution mode, also use next packet header, TCP (transmission control protocol) or UDP (User Datagram Protoco (UDP)) source and target peer-port field in datagram.Data (or application) type of the data of Data-carrying in these field indication groupings, for example Email, file transfer, webpage, TV stream etc. are suchlike.
Under the situation that the IP segmentation occurs, in each segmentation, almost similarly duplicate and reuse the IP stem.Change some field of IP stem, particularly relating to indicate new grouping is those fields of the original packet part of segmentation.Yet, only in first segmentation, stay next packet header, TCP or UDP stem.Because when beginning is considered as TCP and UDP stem during segmentation the part of IP packet payload, this means second and each subsequent segment do not carry the relevant information of TCP or UDP stem.
Therefore, when a series of segmentation enters the router of carrying out the branch group categories, only can correctly classify to first segmentation that comprises complete IP stem and TCP or UDP stem.All the other segmentations lack application related information, and router therefore can not be with correct grouping classification application in these packet segmentations.Usually, do not comprise under the situation of carrying out the enough information of comprehensively classifying at packet segmentation, router adopts the classification application of best endeavors (best effort) in this segmentation.This means if original datagram is the part of prior packet type (for example call), will only preferentially transmit first segmentation, and use lower other segmentation of processed.This may cause the interference in the service that offers the terminal use.
US 2003/0039249, US 2005/0286517, US 2004/0090965 and US2004/0213152 disclose the whole bag of tricks that is used to manage the segmented data packets transmission.Even disclosed whole technology all is subjected to lose in the interstage influence of the problem that transmission also may continue under the situation of segmentation.
The purpose of this invention is to provide and a kind ofly allow to use correct classification and irrespectively transmit the data processing method of segmented data packets with the detailed content of stem.
Summary of the invention
The invention provides a kind of method of management segment data newspaper transmission in the network that comprises terminal equipment and middle route or switching equipment, wherein the segmentation of datagram is carried out on the intermediate equipment of upstream, and this method comprises:
-on the intermediate equipment of downstream, receiving and interim storage first datagram fragmentation, this segmentation comprises the data that allow the datagram fragmentation classification; With
The subsequent segment of reception and the same datagram of interim storage on-the downstream equipment, up to: i) receive the total data section of calling the score, classify according to the grouped data of first segmentation and transmit whole segmentations this moment; Perhaps ii) pass through predetermined period of time and lost at least one segmentation, started the action except being transferred to next equipment this moment.
By before giving next equipment, checking whole segmentations of the datagram that has received, avoided the problem of transmission deficiency of data newspaper with segment transmissions.
Action in step I i preferably includes and abandons whole interim memory segments.
Subsequent segment can also comprise the data relevant with classification.Preferably, step I comprises whole segmentations is distributed in same classification.In one embodiment, this classification is only based on first segmentation.
This method preferably also comprises, after receiving first datagram fragmentation, is enabled in the interior timer of downstream intermediate equipment to determine the time cycle.
Classification can comprise service quality overview (quality of service profile) is applied to segmentation, and can comprise and compared this relevant segments of priority treatment (prioritize) by other grouping of this device processes.
In one embodiment, the service quality overview comprises that the rate limit with professional (traffic) is applied to the datagram target.
Classification can also comprise checks that whole datagram is to determine to be applied to the service quality overview of each segmentation.
Specifically preferably, intermediate equipment checks that at first the first input segmentation is so that determine whether should application class.
The present invention also provides a kind of middle route or switching equipment of using of being used in the network that comprises terminal equipment and at least two such intermediate equipments, wherein on the intermediate equipment of upstream, carry out datagram fragmentation, this intermediate equipment is in the downstream of upstream equipment, and is configured to:
-receiving and interim storage first datagram fragmentation, this segmentation comprises the data that allow the datagram fragmentation classification; With
The subsequent segment of-reception and the same datagram of interim storage, up to: i) receive the total data section of calling the score, intermediate equipment is classified according to the grouped data of first segmentation and is transmitted whole segmentations at this moment; Perhaps ii) passed through the preset time cycle and lost at least one segmentation, this moment, intermediate equipment started the action except being transferred to next equipment.
Such equipment can be used to realize the method according to this invention.
Brief Description Of Drawings
Fig. 1 illustrates the schematic diagram of data network involved in the present invention.
Embodiment
Referring now to Fig. 1,, this network comprises source terminal equipment E1 and target terminal equipment E2.Terminal equipment E1 is that the data link of L1 is connected to first R1 in a series of intermediate equipments (router) by capacity.The MTU of data link (MTU) is the main attribute of being paid close attention to aspect its capacity (under situation of the present invention, 10M bps link with identical MTU will be considered as having identical capacity with 100M bps link).Intermediate equipment R1 is connected to another intermediate equipment R2 by the link of same capability L1 again.Intermediate equipment R2 is that the link that is lower than the L2 of L1 is connected to the 3rd intermediate equipment R3 by capacity.At last, intermediate router R3 is connected to target terminal equipment E2 by the link of raw capacity L1.Only illustrate understanding this, actual network is usually directed to many intermediate equipments and link capacity can change repeatedly in network.
Because link between router R1 and the R2 and identical (being L1) between terminal equipment E1 and router R1, only directly send router R2 to from router R1 from the grouping of terminal equipment E1.Yet,, must give the packet segmentation at R2 because the capacity of the link between router R2 and router R3 is than low capacity (L2).Even if the link from router R3 is a raw capacity, these segmentations also are sent to target terminal equipment E2, and target device E2 ressembles segmentation subsequently to rebulid original packet.
In the present invention, router or switch (intermediate equipment, except the terminal system that relates in communication, router R3 for example) have the buffering of packets memory that wherein can store packet.When middle equipment receives IP segmentation (can discern according to the IP stem) and determines that this segmentation has the branch group categories should object appearing the time, router is stored in this segmentation in the buffering of packets memory temporarily and starts clock.Router continues storage and belongs to this segmentation with a series of segmentations (equally can by the identification of IP stem), reaches from first segmentation and enters the predetermined maximum period of time that packeting memory begins up to receiving whole segmentations or clock.Though this specification is considered the IP stem, also can use such as other stems such as TCP/UDP.These also appear in first segmentation usually.If MTU is very little, stem can appear in other segmentation.
Only when receiving whole segmentation, router is correct minute group categories of the information and executing whole segmentations of basis in the IP of first segmentation stem.In case carried out the branch group categories, then according to the whole segmentations of this classification transmission.Because classification application in each segmentation, also can be used priority, QoS and finishing etc. and is thought that each segmentation provides identical processing.
If through entering the predetermined maximum period of time that packeting memory begins, then occur overtime and abandon the whole segmentations that belong to this series segmentation from first segmentation.
Therefore, the present invention supports to use whole segmentations of correct priority and rate limit forwarding original packet.If also avoided one or more segmentations to lose, sent incomplete datagram in whole system.
Further advantage of the present invention is because can obtain whole original packet, complete grouping inspection supports router according to the content in the original packet load, and not only comes the application service quality overview according to the information in IP of packet, TCP or UDP stem.
Within protection scope of the present invention, can change.

Claims (12)

1.一种在包括终端设备和中间路由或交换设备的网络内管理分段数据报传输的方法，其中数据报的分段在上游中间设备上执行，该方法包括：1. A method of managing segmented datagram transmission within a network comprising terminal equipment and intermediate routing or switching equipment, wherein the segmentation of the datagram is performed on an upstream intermediate equipment, the method comprising: -在下游中间设备上接收和临时存储数据报分段；- receiving and temporarily storing datagram fragments on downstream intermediate devices; -检查所接收的分段的编号；和- check the number of the received segment; and (i)仅当已经接收和存储包括允许数据报分段分类的数据的第一数据分段和该数据报的全部后续分段时，分类该数据分段和将它们传送给下一下游设备；或者(i) classify the data segments and transmit them to the next downstream device only if the first data segment including data enabling the segment classification of the datagram and all subsequent segments of the datagram have been received and stored; or (ii)已经经过预定时间周期和丢失至少一个分段，此时启动除了传输给下一设备之外的动作。(ii) A predetermined period of time has elapsed and at least one segment has been lost, at which point an action other than transmission to the next device is initiated. 2.如权利要求1要求保护的方法，其中在步骤ii中的动作包括丢弃全部的临时存储分段。2. A method as claimed in claim 1, wherein the action in step ii comprises discarding all temporary storage segments. 3.如权利要求1或2要求保护的方法，其中后续分段的至少一个也包括允许分段分类的数据。3. A method as claimed in claim 1 or 2, wherein at least one of the subsequent segments also includes data allowing segment classification. 4.如权利要求1、2或3要求保护的方法，其中在步骤i中分类仅基于在第一分段内的数据。4. A method as claimed in claim 1, 2 or 3, wherein in step i the classification is based only on data within the first segment. 5.如前述任一权利要求要求保护的方法，其中步骤i包括将相同的分类分配给全部分段。5. A method as claimed in any preceding claim, wherein step i comprises assigning the same classification to all segments. 6.如前述任一权利要求要求保护的方法，包括在接收到第一数据报分段之后，启动在下游中间设备内的定时器以确定时间周期。6. A method as claimed in any preceding claim, comprising starting a timer in the downstream intermediate device to determine a time period after receipt of the first datagram fragment. 7.如前述任一权利要求要求保护的方法，其中分类包括将服务质量概况应用于分段。7. A method as claimed in any preceding claim, wherein classifying comprises applying a quality of service profile to the segments. 8.如权利要求7要求保护的方法，其中服务质量概况包括与由该设备处理的其它分组相比使该相关分段优先。8. A method as claimed in claim 7, wherein the quality of service profile includes prioritizing the relevant segment over other packets processed by the device. 9.如权利要求7要求保护的方法，其中服务质量概况包括将业务速率限制应用于数据报目标。9. A method as claimed in claim 7, wherein the quality of service profile includes applying traffic rate limiting to datagram objects. 10.如前述任一权利要求中要求保护的方法，其中分类包括检查整个数据报以确定应用于每个分段的服务质量概况。10. A method as claimed in any preceding claim, wherein classifying includes examining the entire datagram to determine a quality of service profile to apply to each fragment. 11.一种用于在包括终端设备和至少两个这样的中间设备的网络内使用的中间路由或交换设备，其中在上游中间设备上执行数据报分段，该中间设备在上游设备的下游，并配置以：11. An intermediate routing or switching device for use within a network comprising a terminal device and at least two such intermediate devices, wherein datagram fragmentation is performed on an upstream intermediate device which is downstream of the upstream device, and configured with: -接收和存储数据报分段；- receive and store datagram fragments; -检查所接收的分段的编号；和- check the number of the received segment; and (i)仅当已经接收和存储包括允许数据报分段分类的数据的第一数据分段和该数据报的全部后续分段时，分类该数据分段和将它们传送给下一下游设备；或者(i) classify the data segments and transmit them to the next downstream device only if the first data segment including data enabling the segment classification of the datagram and all subsequent segments of the datagram have been received and stored; or (ii)如果已经经过预定时间周期和丢失至少一个分段，启动除了传输之外的动作。(ii) If a predetermined period of time has elapsed and at least one segment is lost, initiate an action other than transmission. 12.如权利要求11要求保护的设备，当配置时根据权利要求1-10任一要求保护的方法操作。12. An apparatus as claimed in claim 11, when configured to operate according to the method as claimed in any one of claims 1-10.
CN200880104877A 2007-08-31 2008-08-29 Method and system for managing transmission of fragmented data packets Pending CN101803303A (en)

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EP07115442A EP2031806A1 (en) 2007-08-31 2007-08-31 Method and system for managing transmission of fragmented data packets
EP07115442.1 2007-08-31
PCT/EP2008/061403 WO2009027513A1 (en) 2007-08-31 2008-08-29 Method and system for managing transmission of fragmented data packets

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WO2009027513A1 (en) 2009-03-05
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